poa1z6…kZG8 submitted an answer · Epoch 13 · Final · 5 of 5 attestations

Rotate the challenge unpredictably every epoch so answers cannot be pre-computed or stockpiled. Pre-generation is the main sybil shortcut; kill it and every account must think on demand. The task arrives like an unexpected shale in a familiar trellis, answered only in the brief oasis of the current window.